BEC Posted April 13, 2006 Share Posted April 13, 2006 Here is a bit of a DIY project for those of you who have a pair of my Type AA/A convertible crossovers and a pair of my CT125 tweeters. This would not apply exactly the same way to original or rebuilt original type AA crossovers. The rest of you may avert your eyes. This mod will lower the crossover frequency from squawker to tweeter and roll off the squawker gently above 4500 hz. OK. First picture is the Mod Kit. Bob Crites 1 Quote Link to comment Share on other sites More sharing options...
BEC Posted April 13, 2006 Author Share Posted April 13, 2006 First a picture of the whole crossover. Right now set up in the AA mode. Bob Crites Quote Link to comment Share on other sites More sharing options...
BEC Posted April 13, 2006 Author Share Posted April 13, 2006 Step 1; Remove the screw holding down the 245 mH inductor. Bob Crites Quote Link to comment Share on other sites More sharing options...
BEC Posted April 13, 2006 Author Share Posted April 13, 2006 Step 2: Place the new 500 uH inductor on top of the 245 uH inductor and install the new stainless screw that is shown in the picture of the kit. Bob Crites Quote Link to comment Share on other sites More sharing options...
BEC Posted April 13, 2006 Author Share Posted April 13, 2006 Step 3: Remove the nut that holds on the top zener diode. Bob Crites Quote Link to comment Share on other sites More sharing options...
BEC Posted April 13, 2006 Author Share Posted April 13, 2006 Step #4: Remove the squawker + output spade connector from the terminal strip. Bob Crites Quote Link to comment Share on other sites More sharing options...
BEC Posted April 13, 2006 Author Share Posted April 13, 2006 Step 5: Spread the spade connector removed in the step above open a bit. Enough to fit over the threads of the zener. Bob Crites Quote Link to comment Share on other sites More sharing options...
BEC Posted April 13, 2006 Author Share Posted April 13, 2006 Step 6: Place the ring lug from the added 500 uH inductor and the squawker output spade connector (the one you spread in step 5) both on the zener stud. Bob Crites Quote Link to comment Share on other sites More sharing options...
BEC Posted April 13, 2006 Author Share Posted April 13, 2006 Step 7: Reinstall the nut on the zener. Now, all we are doing here is just using the zener and its mounting nut as a convenient place to make a connection. Bob Crites Quote Link to comment Share on other sites More sharing options...
BEC Posted April 13, 2006 Author Share Posted April 13, 2006 Step 8: Connect the other wire from the added 500 uH inductor to the terminal that goes out to squawker +. Bob Crites Quote Link to comment Share on other sites More sharing options...
BEC Posted April 13, 2006 Author Share Posted April 13, 2006 Step 9: Unplug the connectors for the black and white wire from the top terminals of the 2 uF capacitor. Bob Crites Quote Link to comment Share on other sites More sharing options...
BEC Posted April 13, 2006 Author Share Posted April 13, 2006 Step 10: Connect the white jumper wire from the bottom 2 uF capacitor right side terminal to the top 2 uF capacitor right side terminal. That places the two 2 uF caps in parallel to make a 4 uF capacitor. Bob Crites Quote Link to comment Share on other sites More sharing options...
BEC Posted April 13, 2006 Author Share Posted April 13, 2006 You are done. Now the schematic would look like this. Bob Crites Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted April 13, 2006 Share Posted April 13, 2006 Retracted Quote Link to comment Share on other sites More sharing options...
BEC Posted April 13, 2006 Author Share Posted April 13, 2006 Retracted also. Bob Crites Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted April 13, 2006 Share Posted April 13, 2006 Retracted Quote Link to comment Share on other sites More sharing options...
Deang Posted April 13, 2006 Share Posted April 13, 2006 I think you need more wire and connectors Bob. O.K. I recant. Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted April 13, 2006 Share Posted April 13, 2006 Bob, Good tutorial. I sure like the sound of my Khorns with this mod. Sweet. Quote Link to comment Share on other sites More sharing options...
soundbound Posted April 14, 2006 Share Posted April 14, 2006 Bob, Great tutorial! What and how much of a difference does the added coil for the 4500 hz Mod make to the squawker? Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted April 14, 2006 Share Posted April 14, 2006 Bob, Great tutorial! What and how much of a difference does the added coil for the 4500 hz Mod make to the squawker? Soundbound, I know you directed this question to Bob, but I wanted to throw in my $0.02. The K55 driver naturally poops out at 6000hz. It sounds o.k. It wasn't until I dropped in the inductor for the squawker that I noticed that the K55 sounds much better not asked to run until it runs out at 6000hz. The narrower bandwidth is very friendly, IMO, to the K55. In a conversation with a Klipsch engineer, he mentioned that Klipsch had also figured that out some time back and made the AK-4 network cross at 4500hz. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.